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Equilibrium (F R = 0) all the x components have to add up to 0 all the y components add up to 0 x components F3 Totalx y components F3 Totaly The object is in equilibrium when Total x and Total y b oth add up to 0. Angle will be 180 o - 22.5 0 = 157.5 o Force will be 153 N

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Newton's first law A body at rest will stay at rest, A body in motion will stay in motion in the absence of an external force....

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Example: When we are in the car at a fast speed and the driver applies the brakes quickly... Without a seat belt we are likely to hit the dash board. Our bodies want to keep moving forward. this is called inertia - kick snow off our boots. - salad spinner -when a magician pulls a tablecloth out from under dishes and the dishes stay put.

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F f(static) ≤ μ s F N m eans that F f will be equal to the opposing force up until its maximum value at which point the object will move F f(kinetic) = μ k F N t he moving object will experience this force of friction Force of Friction

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Newton's Second Law F = ma Force = mass (kg) x acceleration (m/s 2 ) "the fundamental principle of dynamics" The force exerted on a body is equal to the product of the mass (m) and its acceleration (a)

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The acceleration of an object is directly proportional to the net force acting on it and is inversely proportional to its mass. The direction of the acceleration is in the direction of the applied net force F = ma

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The spider problem When the spider is in the elevator there is tension on the thread. p. 314 # 3 A 10.2 g spider is suspended from an elevator ceiling by a thread.

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The spider problem 0.0102 kg a) What is the tension in the thread if the elevator rises at a constant velocity? It is in equilibrium therefor the only force on the string if Fg Fg = 0.0102kg x -9.8 m/s 2 = -0.100N